Solid state chemistry plays a major role in successfully developing a compound into a drug product. The physical and mechanical properties are important in selecting the most appropriate stable form with sufficient solubility. The occurrence of crystallization from a crude reaction mixture is the first step towards obtaining a pure drug substance.
For process chemists crystallization is an essential tool for isolation and purification of the compound in a robust and reproducible way. In addition, the crystallization conditions impact the crystal form or polymorph, particle habit, and its characteristics like stability and bio-availability. Optimized pharmaceutically-acceptable crystallization conditions are established by varying cooling profile and slurry conditions, by adding anti-solvent, or by applying seeding to obtain the preferred form, if needed.